Methods of thermodynamic analysis and gravimetric measurement are used to study graphite and its mixtures with metal oxides heated to 1000°C under nonisothermal conditions. The chemical compatibility of graphite with Ale03, CaO, SiOe, MgO, Fe203, TiO2, Na20, and K20 is investigated. It is shown experimentally that under the given conditions the loss of mass (Am / m ) in specimens with these additives as reflected by the gravimetric curves does not exceed Am / m in a purely graphite specimen.